Enter labeled data points — skills, product specs, survey scores, anything scored on a common scale — and get a live radar chart (also called a spider chart or web chart). Overlay up to 4 datasets to compare, edit any value and watch it redraw instantly, then export as PNG or SVG. Nothing you type ever leaves your browser.
Free exports above are full working PNG/SVG files with a small watermark. for a 4160×4160px PNG export with no watermark, one-time unlock.
A radar chart — also called a spider chart, web chart, or star chart — plots three or more quantitative variables on axes that radiate out from a shared center point, spaced evenly around a circle. Each variable gets its own axis (also called a spoke), and a dataset's value on each axis is marked with a point; connecting those points draws a polygon that gives you an at-a-glance "shape" for that dataset. Radar charts are the standard way to visualize multi-attribute comparisons where every attribute shares a common scale: skill ratings (Speed, Strength, Agility, Endurance…), product or vendor comparisons across several criteria, survey results across categories, or team/individual performance reviews across competencies.
This tool builds the chart with real geometry, computed live in your browser: for N axes, axis i sits at angle 2π × i / N measured clockwise from the top. A value's distance from the center (its radius) is that value scaled linearly against your chart's max — either auto-detected from your highest entered value, or a manual max you set yourself. Converting an (axis, value) pair to an actual point on the page uses x = centerX + r·sin(angle) and y = centerY − r·cos(angle), which is what places axis 0 straight up and walks the rest clockwise around the circle. Every dataset's points are then connected into a closed polygon and layered with a translucent fill, so overlapping shapes from multiple datasets stay readable rather than hiding each other.
Add up to four datasets — each gets its own name, color, and one value per axis — to compare, say, "Product A" against "Product B" and "Product C" on the exact same criteria. The legend below the chart maps each color back to its dataset name, and every polygon updates instantly as you edit any value or label, so you can tune the comparison without re-generating anything.
By default the chart auto-scales its outer ring to your highest entered value, which keeps the chart filling the available space no matter what numbers you're plotting (a 1–10 skill scale, a 0–100 score, or anything else). Turn off auto-scale to fix the outer ring at a specific number yourself — useful when you want two separately-built charts to use the exact same scale for a fair visual comparison, or when your scale has a fixed meaning (like "10 = perfect score").
Both PNG and SVG export are free and produce a real downloadable file, built directly from the same chart you see on screen — the free files include a small watermark. SVG export gives you an infinitely-scalable vector file you can drop straight into a design tool; PNG gives you a flat raster image ready to paste anywhere. A one-time Pro unlock ($5.99) adds a 4160×4160px ("4K") PNG export with no watermark, rendered from the same chart at higher resolution.
Building charts and exporting watermarked PNG/SVG is free and unlimited. Pro adds:
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